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Related Concept Videos

Olfaction01:25

Olfaction

46.7K
The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

10.1K
The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Related Experiment Video

Updated: Nov 11, 2025

A Free-breathing fMRI Method to Study Human Olfactory Function
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Cerebellar involvement in olfaction: An fMRI Study.

Zi-Hao Zhang1, Xiao Liu1, Bin Jing2

  • 1Beijing Chao-yang Hospital, Radiology Department, Capital Medical University, Beijing, P. R. China.

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging
|March 30, 2021
PubMed
Summary

The cerebellum is involved in processing unpleasant odors, not direct smell perception. This study used functional MRI (fMRI) to investigate cerebellar roles in olfactory function.

Keywords:
Cerebellumfunctional MRIfunctional connectivityolfactionresting state

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Area of Science:

  • Neuroscience
  • Olfactory Research
  • Cerebellar Function

Background:

  • The cerebellum's precise role in olfactory processing remains unclear.
  • Understanding cerebellar involvement requires advanced neuroimaging techniques.

Purpose of the Study:

  • To investigate the cerebellum's function during olfactory stimulation.
  • To combine resting-state and task-based functional MRI (fMRI) for enhanced insights.

Main Methods:

  • Functional MRI (fMRI) scans were performed on 50 subjects during olfactory stimulation.
  • Olfactory stimuli (phenylethyl alcohol, isovaleric acid) were delivered via airflow.
  • Seed-based resting-state functional connectivity analysis was employed.

Main Results:

  • Isovaleric acid (unpleasant odor) elicited significant cerebellar activation in specific regions (lobule crus I, lobule VI).
  • Phenylethyl alcohol (neutral odor) did not induce cerebellar activation.
  • Functional connectivity analysis revealed within-cerebellum and corticocerebellar connections.

Conclusions:

  • The cerebellum appears to process responses to unpleasant odors rather than direct olfactory perception.
  • Findings contribute to a better understanding of the cerebellum's complex role in sensory processing.